10 THE AS-INTERFACE MASTERS About Bihl+Wiedemann Bihl+Wiedemann GmbH, founded in 1992 by Jochen Bihl and Bernhard Wiedemann, is a highly specialized, internationally operating engineering company based in Mannheim. It is among the leading providers of safety technology and electronic components for automation technology with AS-Interface. In 1995, Bihl+Wiedemann was the first company to receive a certificate from AS-International for its AS-i master. This master is used as a reference for the certification of AS-i slaves. Other milestones in the history of the Mannheim-based company include the realization of the first AS-i master to comply with specification 3.0, the presentation of the first AS-i master in a stainless steel housing with extended diagnostic functions (2004) and the joining of the AS-Interface safety consortium (2005). Since then, Bihl+Wiedemann has also been among the industry leaders in the area of safety technology with AS-i Safety at Work. In addition to its headquarters in Mannheim, the company has employees in several European countries. Additional sales partners within Germany and abroad ensure that Bihl+Wiedemann is represented worldwide. Basic Concept of AS-Interface AS-Interface is an industrial networking solution for automation systems. It is designed for connecting simplefield I/O devices such as binary ON/OFF and analog, as well as safety I/O devices according to EN 954-1, IEC Using only a two conductor flat or round cable (AS-i cable, 2 x 1.5 mm 2, 16 AWG) to connect all slaves to the master using a free topology. This is the main advantage of this system compared to conventional, parallel wiring, where every single signal has to be wired directly to the control system. PLC I/O I/O PLC AS-Interface Master Data and power are available in the same AS-i cable. Every slave or module has its own address for accessing its data. The slaves can be addressed from 1 to 31 (single slaves), or, with extended addressing, there are 62 slaves available (1A to 31A and 1B to 31B). Single slaves and modules with extended addressing can share the same network. Conventional wiring Standard signals, safety signals and power supply over one cable AS-i Structure AS-i Topology The AS-i Master/Gateway controls the AS-i network and acts as a direct link to the host such as PLC, PC, DCS, etc. A Gateway is an AS-i Master, and simultaneously a slave to higher level network (PROFIBUS, EtherNet/IP, DeviceNet, CANopen, Modbus, etc.). AS-Interface is the lowest level of the automation pyramid intended for Actuator/Sensor networking. It uses bit-wise communication for most common binary field devices (sensor: push button, selector switches, etc.). The level above AS-i is a device level which is an implementation of complex field devices, sensor, and actuator where data exchange occurs mostly byte-wise. Field level is the highest level in the automation hierarchy connecting production facilities at one location and plants at different locations. AS-i supports free topology such as Star, Ring, Linear, Tree and Mesh network (see examples below). Controller Master Tree topology Star topology Controller Master

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